what would make Persona a killer solution for me is if it could hand out disposable email addresses to every site I sign into, that forward transparently to my

what would make Persona a killer solution for me is if it could hand out disposable email addresses to every site I sign into, that forward transparently to my main address (a la Gishpuppy). This way, I can identify which site is the cause of me suddenly receiving a bunch of spam (whether they're doing it themselves or their email database was hacked). Then its a simple question of disabling that disposable address from forwarding to my private one, and notifying the site that their database might be exposed.